Alex de Minaur marches into US Open last 16 as Daria Kasatkina bows out

• Australian leads 6-7 (9) 6-3 6-4 2-0 when Daniel Altmaier retires

• Women's 15th seed knocked out in 6-0 4-6 6-3 loss to Naomi Osaka

Alex de Minaur has surged into the US Open second week for a fifth time with a business-like win over wounded German Daniel Altmaier.

Australia's last player standing once more, De Minaur recovered from a set down to progress after Altmaier retired injured when the Demon was leading 6-7 (9-7) 6-3 6-4 2-0 on Saturday (Sunday AEST).

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